HOLLEY H4777S Double Pumper Carburetor Mechanical Secondary 090127427392 4150

( Brand: Holley ), ( Manufacturer Part Number: H4777S ), ( Part Type: Carburetor ), ( UPC: 090127427392 )

Review HOLLEY 4150 Series Double Pumper Bbl Carburetor Mechanical Secondary

The Holley H4777S 4150 Double Pumper Carburetor is a high-performance fuel delivery system designed for racing applications. This mechanical secondary carburetor offers superior throttle response, idle stability, and fuel management capabilities.

The H4777S Double Pumper features a 4150 series body, which is known for its durability and reliability. The body is constructed from aluminum and is finished with a high-gloss black coating for a sleek and professional appearance. The carburetor comes with Holley's legendary vacuum secondary system, which utilizes a mechanical diaphragm to activate the secondary circuit. This system provides a smooth and predictable powerband, making it ideal for both street and racing use.

The H4777S Double Pumper is equipped with a 650 CFM primary and a 750 CFM secondary venturi. The primary venturi is designed for optimal fuel delivery at low to mid RPMs, while the secondary venturi ensures that the engine receives the necessary fuel for high RPM power. The carburetor also comes with Holley's proprietary Accel Gen III AVS electronic choke system, which provides quick and efficient choking for easy starting.

The H4777S Double Pumper Carburetor is fully adjustable, allowing users to fine-tune the fuel mixture for their specific engine and application. It comes with a total of 12 adjustment points, including main jet, power valve, emulsion tube, and secondary jet. The carburetor is also compatible with Holley's electronic fuel pressure regulators, making it easy to maintain the correct fuel pressure.

The H4777S Double Pumper Carburetor is a high-performance fuel delivery system that offers superior fuel management capabilities and a smooth powerband. Its durable construction, adjustability, and compatibility with Holley's electronic accessories make it an ideal choice for serious racers and enthusiasts. Whether you're looking to maximize the performance of your race car or simply want to improve the fuel efficiency of your daily driver, the Holley H4777S 4150 Double Pumper Carburetor is an excellent choice.

The Holley H4777S 4150 Double Pumper Carburetor with Mechanical Secondary is a popular choice among automotive enthusiasts for its ability to provide excellent fuel delivery for high-performance applications. Here are some pros and cons that may help you make an informed decision about purchasing this carburetor:

1. Mechanical Secondary: The mechanical secondary feature provides an additional fuel source during wide-open throttle conditions, ensuring optimal fuel delivery for maximum power.

2. Adjustable Fuel Mixture: This carburetor comes with adjustable main and secondary fuel mixtures, allowing you to fine-tune the fuel delivery to meet the specific needs of your engine.

3. Fuel Pressure Regulator: The built-in fuel pressure regulator simplifies the installation process and eliminates the need for a separate regulator.

4. Billet Aluminum Construction: The billet aluminum construction not only looks great but also provides durability and resistance to corrosion.

5. Easy-to-Use Design: The Holley H4777S 4150 Double Pumper Carburetor has a simple and easy-to-use design, making it a popular choice among hobbyists and professionals alike.

1. Complex Installation: Installing a carburetor like the Holley H4777S 4150 Double Pumper Carburetor can be a complex process, requiring a significant amount of time and expertise.

2. Expensive: Compared to some other carburetors on the market, the Holley H4777S 4150 Double Pumper Carburetor is relatively expensive.

3. Requires Regular Maintenance: Carburetors require regular maintenance to ensure proper fuel delivery and optimal engine performance. This can be time-consuming and may require additional expenses.

The Holley H4777S 4150 Double Pumper Carburetor with Mechanical Secondary offers excellent fuel delivery for high-performance applications, but it comes with some drawbacks. Its complex installation, expensive price tag, and requirement for regular maintenance are important factors to consider before making a purchase. However, if you are looking for a carburetor that delivers maximum power and can be fine-tuned to meet the specific needs of your engine, the Holley H4777S 4150 Double Pumper Carburetor may be worth the investment.

If you are looking for a high-performance carburetor and are willing to invest the time and resources into its installation and maintenance, the Holley H4777S 4150 Double Pumper Carburetor with Mechanical Secondary could be an excellent choice for you. However, if you are looking for a more affordable or easier-to-install option, there may be other carburetors on the market that better suit your needs. It is essential to carefully consider your specific requirements and budget before making a decision.

Details:

This product is not legal for use on vehicles that are operated public highways. Not for use on a street-driven vehicle. Double Pumper carburetors are an American icon when it comes to performance carburetors.From their roots as the premier carburetor on many factory muscle cars powering thousands of vehicles across finish line is a great choice whether you burning up street or quarter mile.

part #: h4777s price

• $699.95

specifications carbcoon:

• brand: Holley
• mpn: H4777s
• part type: Carburetor
• upc: 090127427392

seller carbcoon:

• rating: 99.6%
• # reviews: 48352
• city: Huntington Beach, California

shipping carbcoon:

• type: Calculated
• carrier: UPS, FedEx
• cost: $35.29
• transit: 4-8 Days
• service: UPS Ground, UPS 2nd Day Air, FedEx Ground / FedEx Home Delivery
• class: Standard, Expedited

offer carbcoon:

• sold: 0
• quantity: 1
• started: March 6, 2026
• options: Ship-to-home
• availability: In Stock

payments carbcoon:

• other
• wallet: Apple-pay
• credit card: Visa

returns carbcoon:

• policy: Returns Accepted
• paid by: Seller
• time: 30 Days

general carbcoon:

• condition: New
• Car Truck Parts Accessories > Air Fuel Delivery > Carburetors

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